1) A not uncommon term in the seventeenth and eighteenth centuries, possibly for wood that was partly decayed but useful at least for firewood.
1677 a sacke fill’d with rotten wood and straw, Quarmby
1686 there was laid on her house side to dry betwixt two or three strokes of rottnewood, Golcar. However, it had a valuation in some inventories and was brought to clothiers in Wakefield as cargo: 1696 in Rotten Wood Ł1 11s, Holmfirth
1759 things … that comes up bye watter are … plaister, iron, rotten wood, Wakefield. It was evidently used in the domestic cloth industry, so it should be noted that Wright lists it as an ingredient in dyeing, albeit without examples.